Calculation method for step cruise fuel consumption of aircraft

The embodiment of the invention relates to a method for calculating the step cruise fuel consumption of an aircraft. The method comprises the following steps: determining increased gravitational potential energy of an aircraft in a climbing section by utilizing increased height of the climbing section during step cruising of the aircraft; according to the fact that the aircraft stably flies to the preset distance, work done by thrust of an aircraft engine is determined; according to energy conservation, the gravitational potential energy increased by the aircraft is equal to fuel energy consumed by the climbing section due to increase of the gravitational potential energy, and the fuel energy consumed by the climbing section due to increase of the gravitational potential energy is approximately equal to work done by thrust of an aircraft engine when the aircraft stably flies to a preset distance. According to the embodiment of the invention, the performance of the climbing section in the step cruising process